Although the pair was unable to spend their birthday together since they are both recovering from recent falls, they still consider each other best friends.

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The twins were born two months premature in Chicago in 1909. They weighed a combined 7 lbs. Since they were born before incubators were invented, they were wrapped in blankets and put in the door of a stove to keep warm, reported the Daily Mail.

Eisgrou moved to Florida in 1949, and Primack followed her in 1971. There, they enjoyed the majority of their lives, outlived their husbands, and had one son each.

They're both astonished by their record-breaking age.

"I can't believe it, that I've reached that age. The good thing is our minds are sharp. That's the only good thing," Primack told ABC.

Amazingly, the twins continue to live almost completely independently.

Eisgrou started driving at age 78, and didn't stop until four years ago, when her now 71-year-old son told her "I shouldn't get a new car with all the hijackings," reported the Daytona Beach News-Journal.

They both use a cane to walk, but are healthy and independent. Primack even survived ovarian cancer years ago.

Their longevity may in part be due to their sense of humor. They recalled to the Daytona Journal that they often used to switch husbands when they visited each other.

"I used to visit Daytona and we'd switch husbands and walk in the temple," Primack said, "And they'd say to me, 'Charlotte, you look so good.'"

"Nobody ever knew the difference. And by the time they found out, they were hysterical," Eisgrou told ABC. "We had so much fun."

Wu Conghan, 101, and his wife Wu Sognshi, 103, pose for their wedding photos in Nanchong, Sichuan Province, China - 05 Nov 2012.
A centenarian couple who have been married for 88 years have finally got to take the wedding photos they couldn't take when they were first married. Wu Conghan, 101, and his wife Wu Sognshi, 103, married in 1924, and have been together for almost nine decades. (HAP / Quirky China News / Rex USA)